plug gap

rppngears · 08-22-2002, 03:24 PM

I changed my plugs about two years ago and just put them in, not worrying about the gap size. Since I have learned of the importance of gapping them, but I am not sure how much of a difference it will make. Do you think it's worth it to remove all the plugs and regap them??

USMC302 · 08-22-2002, 04:51 PM

You should replace you plugs every 20k miles anyway, buy a new set and gap them accordingly.

Agent_4573 · 08-22-2002, 07:22 PM

any damage that could be attributed to gap size would have been done already. I wouldstill suggest buying some new plugs and gapping them correctly. You might notice a power difference.

HiFlow5 0 · 08-23-2002, 06:54 AM

Quote:

Originally posted by rppngears
I changed my plugs about two years ago and just put them in, not worrying about the gap size. Since I have learned of the importance of gapping them, but I am not sure how much of a difference it will make. Do you think it's worth it to remove all the plugs and regap them??

Ouch, 2 years hu? You should notice a difference with new plugs and gapped correctly!

rppngears · 08-23-2002, 07:10 AM

I think it's been about 30k miles since my plug change. Last time I did it, I did plugs, wires, cap and rotor. Should I do them all again, or just the plugs? How many miles should you let wires, cap and rotor go?

Also, what do you recommend gapping them at for a pretty much stock motor?

Agent_4573 · 08-23-2002, 09:15 AM

I replace my cap, rotor and wires every 50-60k miles. Some new cars go 100k without recommendations to change them. I think you'll be fine with just a new set of plugs. Standard gap for the plugs, AND SOMEONE CORRECT ME IF I'M WRONG!, is .052-.054 unless your running a power adder or nitrous.

SlowGT · 08-23-2002, 09:51 AM

For 95 the recommended gap is something like .056-.060". I used .058 after my last set of upgrades and the car was sluggish. Somebody recommended tightening the gap to .040". I regapped mine to .045" and the car definitely behaved better. The throttle response seemed to be snappier. Didn't really notice any difference in the 'getup & go' department. I would've tried them at .040" after .045 made such a difference if the =length headers didn't make it such a pain in the ***** to change them.

HiFlow5 0 · 08-23-2002, 03:08 PM

On your 91 .045" is recomended, and will work fine. I change my plugs every 10-20k miles, I change my cap and rotor every other oil change just to make sure its clean and arc free. Wires I would change every 40-50k miles. These parts a fairly cheap to replace, and it just ensures that your car is running properly.

08-22-2002, 03:24 PM	#1
rppngears Registered Member Join Date: Jul 2002 Location: Maryland Posts: 51	plug gap I changed my plugs about two years ago and just put them in, not worrying about the gap size. Since I have learned of the importance of gapping them, but I am not sure how much of a difference it will make. Do you think it's worth it to remove all the plugs and regap them?? __________________ '91 MUSTANG LX 5.0. Flowmaster Catback Exhaust, In Fender K&N air intake, timing advancement, high voltage coil, pheonix gold/kicker stereo, pro 5.0 shifter.

08-22-2002, 04:51 PM	#2
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	You should replace you plugs every 20k miles anyway, buy a new set and gap them accordingly. __________________

08-22-2002, 07:22 PM	#3
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	any damage that could be attributed to gap size would have been done already. I wouldstill suggest buying some new plugs and gapping them correctly. You might notice a power difference. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

08-23-2002, 07:10 AM	#5
rppngears Registered Member Join Date: Jul 2002 Location: Maryland Posts: 51	I think it's been about 30k miles since my plug change. Last time I did it, I did plugs, wires, cap and rotor. Should I do them all again, or just the plugs? How many miles should you let wires, cap and rotor go? Also, what do you recommend gapping them at for a pretty much stock motor? __________________ '91 MUSTANG LX 5.0. Flowmaster Catback Exhaust, In Fender K&N air intake, timing advancement, high voltage coil, pheonix gold/kicker stereo, pro 5.0 shifter.

08-23-2002, 09:15 AM	#6
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	I replace my cap, rotor and wires every 50-60k miles. Some new cars go 100k without recommendations to change them. I think you'll be fine with just a new set of plugs. Standard gap for the plugs, AND SOMEONE CORRECT ME IF I'M WRONG!, is .052-.054 unless your running a power adder or nitrous. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

08-23-2002, 09:51 AM	#7
SlowGT Registered Member Join Date: Jun 1999 Location: Columbia Co, PA Posts: 303	For 95 the recommended gap is something like .056-.060". I used .058 after my last set of upgrades and the car was sluggish. Somebody recommended tightening the gap to .040". I regapped mine to .045" and the car definitely behaved better. The throttle response seemed to be snappier. Didn't really notice any difference in the 'getup & go' department. I would've tried them at .040" after .045 made such a difference if the =length headers didn't make it such a pain in the *** to change them. __________________ Old Slow GT New Slow GT--> under construction Latest Addition: 95 Cobra R**, #73, bone stock, ~6100 miles.

08-23-2002, 03:08 PM	#8
HiFlow5 0 Registered Member Join Date: Mar 2000 Location: Springfield, Ma, usa Posts: 706	On your 91 .045" is recomended, and will work fine. I change my plugs every 10-20k miles, I change my cap and rotor every other oil change just to make sure its clean and arc free. Wires I would change every 40-50k miles. These parts a fairly cheap to replace, and it just ensures that your car is running properly. __________________ NewEngland Auto www.baystategearheads.com -91 Mustang Coupe, ex 4cyl (sold) -99 F150, 3" lift, 35" Procomps, Magnaflow exhaust

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